applied sciences Article Iron-Rich Magnetic Coal Fly Ash Particles Induce Apoptosis in Human Bronchial Cells Matthew J. Lawson 1, Zoe C. Prytherch 1, Tim P. Jones 2, Rachel A. Adams 3 and Kelly A. BruB 1,* 1 School of Biosciences, Cardi University, Museum Avenue, Cardi CF10 3AX, UK m.j.lawsonsoton.ac.uk (M.J.L.) prytherchzccardi .ac.uk (Z.C.P.) Dec 01, 2016 The iron rich-fly ash (Fe 2 O 3 or Fe 3 O 4) is generally avoided because it is believed that it decreases the compressive strength of geopolymer cements/binders . But for the mass production of fly-ash geopolymer binders, such limitation should overcome. Iron rich brown fly ash has been segregated into (a) coarse, and (b) fine size fractions using air classification. The suitability of fine iron-rich fly ash (CFA) has been evaluated for the synthesis of geopolymer.The behavior of CFA based geopolymer in relation to reactivity, NaOH concentration and sodium silicate to sodium hydroxide (S/H) ratio has been studied.